class ViewRef
Defined at line 585 of file fidling/gen/sdk/fidl/fuchsia.ui.views/fuchsia.ui.views/hlcpp/fuchsia/ui/views/cpp/fidl.h
A ViewRef is a handle to a kernel object which identifies a unique View
across the system. Two ViewRefs to the same View have the same KOID.
Clients use a ViewRef to identify a View, to validate a View, and to
receive a View invalidation signal.
As part of View creation, the client creates a linked
ViewRef/ViewRefControl pair and hands the pair to Scenic (ViewRefControl is
described below). The client must remove the ViewRef's signal
capabilities; otherwise the View is not created.
The client may freely clone its ViewRef and share it, even before sending
it to Scenic.
Example 1. Accessibility accepts a ViewRef from a client to group the
semantic nodes, and semantic operations, associated with a client's View.
It must validate a client's ViewRef with Scenic.
Example 2. We use ViewRefs to create a FocusChain, which identifies Views
considered as "in-focus" down the View hierarchy. When a View is destroyed,
Scenic signals to all FocusChain holders that the ViewRef is now invalid.
Public Members
eventpair referencePublic Methods
::std::unique_ptr<ViewRef> New ()void Encode (::fidl::Encoder * _encoder, size_t _offset, std::optional< ::fidl::HandleInformation> maybe_handle_info)void Decode (::fidl::Decoder * _decoder, ViewRef * value, size_t _offset)zx_status_t Clone (ViewRef * result)